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  1. #1
    Join Date
    Feb 2012
    Posts
    212

    Thumbs up Bobcat 225g plus hertz

    I've been checking my welder by the ac plugs keeping it close to 120volts with meter could you explain how to do it by hertz i use a little tiny tac to check rpm says in manual 3600 + or - 50 I believe I keep it on the low end it's running aright just don't understand hertz thanks what setting on my meter do i use
    Last edited by Kpack; 05-17-2012 at 06:19 AM.

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,447

    Default

    Your 150 rpm ish too low, if you measure it via your tiny tac.
    These engine drives run in at 3700 to 3750 high idle

    The true generator measurement is taken in HZ with your meter probes stuck in the 120 aux terminals with the engine adjusted to 62.5hz high idle no load. With around 43-44 hz low idle.

    Yours set the way it is, drops in frequency to less than 60hz when something is pluged into it.

    Plus when you weld the low rpm fudges the weld wave forms, you should be much happier with the welder capability when its adjusted correctly
    Last edited by cruizer; 05-17-2012 at 09:13 AM.

  3. #3
    Join Date
    Dec 2011
    Posts
    382

    Default

    You need a meter that measures frequency-don't know if yours has this function. Down into the range of 60 cycles per second. From the bad ole days-- 1 cycle per second=1 hertz.
    Meltedmetal

    Or you could use an oscilloscope but unless you already have one that's the pricey complicated way to go.
    Last edited by Meltedmetal; 05-17-2012 at 10:56 AM.

  4. #4
    Join Date
    Feb 2012
    Posts
    212

    Thumbs up Bobcat 225 hertz

    Thank you i am going to work on setting it right

  5. #5
    Join Date
    Feb 2012
    Posts
    212

    Thumbs up Bobcat

    Hey cruiser read miller manual it does say 3700 RPMs but in onan p216 manual says 3600 RPMs maybe that's we're I got it I've got it set now over 3700 have not welded with it yet thanks

  6. #6
    Join Date
    Feb 2012
    Posts
    212

    Default Bobcat rpms

    Hey cruizer we talked awhile back about setting the rpms up to 3750 rpms I did it and it did weld better thanks

  7. #7
    Join Date
    Feb 2012
    Posts
    212

    Default

    I bought a newer bobcat with a Subaru engine and they had it set right on 60 hz and it would blow some holes. I reset it to 62.5 and it welds a lot better.
    I wonder why they don't set it like this at the factory ?

  8. #8
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,447

    Default

    Quote Originally Posted by Kpack View Post
    I bought a newer bobcat with a Subaru engine and they had it set right on 60 hz and it would blow some holes. I reset it to 62.5 and it welds a lot better.
    I wonder why they don't set it like this at the factory ?
    I can't answer this question, though at 60HZ, you'd be blowing boards (if you had boards, bobcat doesn't), and have an inconsistant arc at best. Lincoln sets them way high and Miller often too low. Maybe this is to keep the repair shops busy.

  9. #9
    Join Date
    Apr 2012
    Location
    Western Pa.
    Posts
    213

    Default Bobcat 225g plus hertz

    Cruizer; I have 1988 area Big 40 Diesel
    Ser. # JJ404151 has Stanadyne injection sys. I think manual said set to 1850 rpm. Had pump rebuilt couple month ago & ask them to set to 1850 rpm. I installed & timed myself but hv not cked rpm. Welds fine but how do u recommend fine tuning this machine.
    Thx Greg

  10. #10
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,447

    Default

    60.5hz measured at the auxillary 120 vac terminals

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